The Downtown Brooklyn Landmarks Coalition, which is made up of the Park Slope Civic Council, the Brooklyn Heights Association, Cobble Hill Association, Prospects Heights Neighborhood Development Corporation, Friends of Terracotta, DUMBO Neighborhood Association, and the Boerum Hill Association was created in 2023 in response to the rapid development occurring in Downtown Brooklyn. The coalition aims to identify buildings worthy of designation to preserve the historic and cultural significance of the neighborhood before it is lost. 

HDC will assist the Downtown Brooklyn Landmarks Coalition with strategies and publicity to advance their landmarking campaign for significant buildings and sites in Downtown Brooklyn.